#!/usr/bin/env python
import os
import sys
import platform
import json

URLS = ["https://storage.mds.yandex.net/get-devtools-opensource/250854/09a45531197e91719e5964e4188ab6c9"]
MD5 = "09a45531197e91719e5964e4188ab6c9"

RETRIES = 5
HASH_PREFIX = 10

HOME_DIR = os.path.expanduser('~')


def create_dirs(path):
    try:
        os.makedirs(path)
    except OSError as e:
        import errno

        if e.errno != errno.EEXIST:
            raise

    return path


def misc_root():
    return create_dirs(os.getenv('YA_CACHE_DIR') or os.path.join(HOME_DIR, '.ya'))


def tool_root():
    return create_dirs(os.getenv('YA_CACHE_DIR_TOOLS') or os.path.join(misc_root(), 'tools'))


def ya_token():
    def get_token_from_file():
        try:
            with open(os.environ.get('YA_TOKEN_PATH', os.path.join(HOME_DIR, '.ya_token')), 'r') as f:
                return f.read().strip()
        except:
            pass
    return os.getenv('YA_TOKEN') or get_token_from_file()


TOOLS_DIR = tool_root()


def uniq(size=6):
    import string
    import random

    return ''.join(random.choice(string.ascii_lowercase + string.digits) for _ in range(size))


def _fetch(url, into):
    import hashlib

    try:
        from urllib2 import urlopen
        from urllib2 import Request
        from urlparse import urlparse
    except ImportError:
        from urllib.request import urlopen
        from urllib.request import Request
        from urllib.parse import urlparse

    request = Request(str(url))
    request.add_header('User-Agent', 'ya-bootstrap')
    if urlparse(url).netloc == 'proxy.sandbox.yandex-team.ru':
        token = ya_token()
        if token:
            request.add_header('Authorization', 'OAuth {}'.format(token))

    md5 = hashlib.md5()
    sys.stderr.write('Downloading %s ' % url)
    sys.stderr.flush()
    conn = urlopen(request, timeout=10)
    sys.stderr.write('[')
    sys.stderr.flush()
    try:
        with open(into, 'wb') as f:
            while True:
                block = conn.read(1024 * 1024)
                sys.stderr.write('.')
                sys.stderr.flush()
                if block:
                    md5.update(block)
                    f.write(block)
                else:
                    break
        return md5.hexdigest()

    finally:
        sys.stderr.write('] ')
        sys.stderr.flush()


def _atomic_fetch(url, into, md5):
    tmp_dest = into + '.' + uniq()
    try:
        real_md5 = _fetch(url, tmp_dest)
        if real_md5 != md5:
            raise Exception('MD5 mismatched: %s differs from %s' % (real_md5, md5))
        os.rename(tmp_dest, into)
        sys.stderr.write('OK\n')
    except Exception as e:
        sys.stderr.write('ERROR: ' + str(e) + '\n')
        raise
    finally:
        try:
            os.remove(tmp_dest)
        except OSError:
            pass


def _extract(path, into):
    import tarfile

    tar = tarfile.open(path, errorlevel=2)
    tar.extractall(path=into)
    tar.close()


def _get(urls, md5):
    dest_path = os.path.join(TOOLS_DIR, md5[:HASH_PREFIX])

    if not os.path.exists(dest_path):
        for iter in range(RETRIES):
            try:
                _atomic_fetch(urls[iter % len(urls)], dest_path, md5)
                break
            except Exception:
                if iter + 1 == RETRIES:
                    raise
                else:
                    import time
                    time.sleep(iter)

    return dest_path


def _get_dir(urls, md5, ya_name):
    dest_dir = os.path.join(TOOLS_DIR, md5[:HASH_PREFIX] + '_d')

    if os.path.isfile(os.path.join(dest_dir, ya_name)):
        return dest_dir

    try:
        packed_path = _get(urls, md5)
    except Exception:
        if os.path.isfile(os.path.join(dest_dir, ya_name)):
            return dest_dir
        raise

    tmp_dir = dest_dir + '.' + uniq()
    try:
        try:
            _extract(packed_path, tmp_dir)
        except Exception:
            if os.path.isfile(os.path.join(dest_dir, ya_name)):
                return dest_dir
            raise

        try:
            os.rename(tmp_dir, dest_dir)
        except OSError as e:
            import errno
            if e.errno != errno.ENOTEMPTY:
                raise

        return dest_dir
    finally:
        import shutil
        shutil.rmtree(tmp_dir, ignore_errors=True)
        try:
            os.remove(packed_path)
        except Exception:
            pass


def _mine_arc_root():
    return os.path.dirname(os.path.realpath(__file__))


def main():
    if not os.path.exists(TOOLS_DIR):
        os.makedirs(TOOLS_DIR)

    with open(_get(URLS, MD5), 'r') as fp:
        meta = json.load(fp)['data']
    my_platform = platform.system().lower()
    my_machine = platform.machine().lower()
    if my_platform == 'linux':
        my_platform = 'linux-ppc64le' if 'ppc64le' in platform.platform() else 'linux_musl'
    if my_platform == 'darwin' and my_machine == 'arm64':
        my_platform = 'darwin-arm64'

    # match by max prefix length, prefer shortest
    best_key = max(meta.keys(), key=lambda x: (len(os.path.commonprefix([my_platform, x])), -len(x)))
    value = meta[best_key]

    if len(sys.argv) == 2 and sys.argv[1].startswith('--print-sandbox-id='):
        target = sys.argv[1].split('=')[1]
        best_target = max(meta.keys(), key=lambda x: len(os.path.commonprefix([target, x])))
        sys.stdout.write(str(meta[best_target]['resource_id']) + '\n')
        exit(0)

    ya_name = {'win32': 'ya-bin.exe'}.get(best_key, 'ya-bin')  # XXX
    ya_dir = _get_dir(value['urls'], value['md5'], ya_name)

    # Popen `args` must have `str` type
    ya_path = str(os.path.join(ya_dir, ya_name))

    env = os.environ.copy()
    # Avoid ya crashes when users set debug variables.
    env.pop('Y_PYTHON_SOURCE_ROOT', None)
    env.pop('Y_PYTHON_ENTRY_POINT', None)
    if 'YA_SOURCE_ROOT' not in env:
        src_root = _mine_arc_root()
        if src_root is not None:
            env['YA_SOURCE_ROOT'] = src_root
    # For more info see YT-14105
    if 'LD_PRELOAD' in env:
        sys.stderr.write("Warn: LD_PRELOAD='{}' is specified and may affect the correct operation of the ya\n".format(env['LD_PRELOAD']))

    if os.name == 'nt':
        import subprocess

        p = subprocess.Popen([ya_path] + sys.argv[1:], env=env)
        p.wait()
        sys.exit(p.returncode)
    else:
        os.execve(ya_path, [ya_path] + sys.argv[1:], env)


if __name__ == '__main__':
    try:
        main()
    except Exception as e:
        sys.stderr.write('ERROR: ' + str(e) + '\n')
        sys.exit(1)